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Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Had the same thing happen to my Vizio TV. It was on warranty, and they replaced the motherboard. It's been fine since then. There appear to be only a very few parts inside. Power supply, motherboard, and display. That's it. Your power supply is good, as is your display. You just need a motherboard.

Your signal board (also called, main board) is at fault. This board has all your RF connections,RCA jacks, com0nent connections etc. I have repaired many of these Vizios. Thanks for asking me.Matt of Martins TV.

Sounds like you have a backlight problem. To verify this, turn on the set and dim the lights in the room. Take a bright flashlight and shine it on the screen. If you see a faint picture, you either have a back inverter or a bad backlight bulb.

You should let it sits for at least 72 hours. does the TV have a orange Vizio logo light when you plug in the power? what about when you turn it on, does the Vizio logo light turns white? if yes to these two questions and you still does not have picture or sound, it could be your main board or inverter that got fried.